KR20030081105A - Optical disk reproduction apparatus and optical disk reproduction controlling method - Google Patents

Abstract

If the encryption decoder 6 detects a password in units of digital audio content, the wobble detection device 13 detects a wobble pattern of the optical disk, and the content data is encrypted, the control unit, The presence or absence of a wobble pattern is determined, and playback is stopped when there is a wobble pattern, and when there is no wobble pattern, the playback operation is controlled according to the digital CCI. If the content data is not encrypted, the playback operation is controlled in accordance with the watermark CCI, with or without the wobble pattern. Accordingly, reproduction of the illegal copy disc is excluded.

Description

Optical disc player and optical disc playback control method {OPTICAL DISK REPRODUCTION APPARATUS AND OPTICAL DISK REPRODUCTION CONTROLLING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates generally to a playback control method and apparatus for controlling a system stream of multimedia data including recorded digital audio data, and more particularly to an optical disk playback that prevents playback of content from illegally copied digital disks. An apparatus and method are provided.

In recent years, instead of laser discs, video CDs, and other conventional formats, many movie titles and music titles have been popularized in the form of DVD-Video and DVD-Audio media with dramatically improved recording capacities. DVD-Video standard discs and DVD-Audio standard discs record high quality digital audio data and digital video data.

In order to prevent such illegal digital copying of high quality digital data, digital copy control management information (hereinafter, abbreviated as "digital CCI") included in the system stream and electronic watermark copy control management information (hereinafter, watermark) Copy control is executed using CCI or abbreviated "WMCCI".

AV digital devices identify not only the external devices being connected, but also identify the external devices being connected, as well as advanced secure digital I / Fs (e.g., IEEE1394 I / F) arranged to transmit encrypted data. There is also a conventional, non-secure digital I / F (e.g. IEC60958) which transmits unencrypted data without any means. In the market, there are few digital recorders with secure I / F, and most of the digital recorders with unsecured I / F without a watermark detection device occupy most of the market.

In other words, at present, most AV players use digital I / F which is not secure. The non-secure digital I / F cannot identify legitimate devices and allows digital data to be received and transmitted from any illegally tampered or fraudulent recorder. Insecure digital I / F also does not encrypt the transmitted data, so that the security of the data is hardly guaranteed.

On the other hand, the Internet system has been widely spread around the world, and so many web sites are constructed on the Internet. Some web sites allow users to upload AV content data via a personal computer (hereinafter referred to as a PC) using non-secure digital I / F, and the AV content is not secured digital I / F. Use F to provide a free download service to other users via a PC.

If a user uploads an illegal copy of AV content data to a web site, another user can download the illegal copy data from the web site free of charge without permission of the supplier who handles the AV content data. This causes serious damage to the AV content providers of movie titles and music titles when fraudulent copies are distributed throughout the market.

In the conventional copy control management system, digital CCI and watermark CCI are included in the system stream, thereby preventing illegal analog copy and digital copy in a recorder equipped with a watermark CCI detection device. An example of the data structure of such a conventional system stream is shown in FIG. As shown in this figure, the digital CCI exists in the header part of the Audio_Pack, and the watermark CCI is included in the Audio_data part of the Audio_Pack.

However, in such a conventional copy control management system, copying all data of a system stream including encrypted data and content data from an original disk makes it possible to reproduce the copy data using an ordinary optical disk reproducing apparatus. Therefore, it is possible to create a myriad of illegal copy discs that can be reproduced by the conventional optical disc reproducing apparatus. Reproducing such countless illegally copied disk data with a conventional optical disk reproducing apparatus causes a problem that countless digital copies are illegally created through unsecured digital I / F.

For example, in the conventional optical disc reproducing apparatus disclosed in Japanese Patent Laid-Open No. 2001-229612, reproduction of a system stream including both digital CCI and watermark CCI is performed by digital CCI contained in each content unit. Is encrypted according to the digital CCI. On the other hand, when the digital CCI is not encrypted, reproduction of the system stream is controlled in accordance with the watermark CCI.

The reproduction operation for copying content in such a conventional optical disc reproducing apparatus will be described below with reference to Figs. 10 (a), 10 (b) and 11. The original disc is a commercially available press-made disc having a recording pit, the content data is encrypted, the digital copy control management information (digital CCI) is set to restrictive copying, and the watermark copy control management information. It is assumed that (water mark CCI) is set to copy protection.

Fig. 10A shows a case where a digital copy of the content data of this original disk is made with a non-normal recorder to create a myriad digital copy disk. As shown in Fig. 10A, since the content data of each copy disk is recorded in a decrypted (decoded) format, the content data is not encrypted, and the digital CCI is set to restrictive copying. , Watermark CCI is set to copy-protected.

When the copy disk is reproduced by the conventional optical disk reproducing apparatus, the reproduction control is executed in accordance with the operation pattern shown in Fig. 11B. More specifically, since the content data is not encrypted, playback is controlled in accordance with the watermark CCI set to copy prohibition in this case.

Therefore, it is detected that the state of the watermark CCI is not set to copy free, and it judges that the used disk is an unauthorized disk, and mutes the output of the playback apparatus. As a result, any copy disk that illegally digitally copies the contents from the original disk can be excluded. It should be borne in mind that Fig. 11A shows the operation pattern of the reproduction control when the content data is encrypted and the encryption code is used on the use disk.

Fig. 10 (b) shows a case where an unlimited number of illegally copied disks are created by analog copying of content data of the original disk with a non-normal recorder. As shown in Fig. 10 (b), since the content data of each copy disk is recorded in a decrypted (decoded) format, the content data is not encrypted and is analog copied, so no digital CCI exists. , The watermark CCI is set to copy-protected state.

When the copy disk is reproduced by the conventional optical disk reproducing apparatus, the reproduction control is executed in accordance with the operation pattern shown in Fig. 11B. Therefore, playback is controlled in accordance with the watermark CCI, and it is determined that the used disk is an unauthorized disk, and the output of the playback apparatus is muted. As a result, any copy disk that illegally analog copies the contents from the original disk can be excluded.

Another conventional optical disc reproducing apparatus is disclosed in Japanese Patent Laid-Open No. 7-272282 (Japanese Patent Publication No. 3021098). In this conventional optical disc reproducing apparatus, the optical disc to be reproduced includes a pit of a predetermined pattern in which a group of pits are arranged in a wobble shape on a data track. This makes it possible to use the pit of the predetermined pattern to determine whether the optical disk is a legal copy disk. If a negative copy disk is used, it is regarded as an illegal disk in which the pit of the predetermined pattern is detected so that the optical disk should be excluded.

However, in the conventional copy control management system disclosed in the above first document (Japanese Patent Laid-Open No. 2001-229612), if all data of the original optical disk is copied, a myriad of illegal copy disks can be created. By reproducing the data of a myriad of illegally copied disks with a conventional optical disk reproducing apparatus, a myriad of digital copies can be illegally created without any limitation, so that an illegal copy of the same generation can be duplicated many times. Specifically, if all data on the disc is illegally copied bit by bit, the conventional optical disc reproducing apparatus can hardly identify an illegal copy disc and cannot be excluded.

The problem of the regeneration control of the above-described conventional configuration will be described with reference to FIG. All encrypted digital data including the content data of the original disk are digitally copied with a non-normal recorder to create a myriad of illegal copy disks. The data of each copy disk is encrypted, digital CCI is limited copying, and watermark CCI is set to copy prohibition.

When the copy disc is reproduced by the conventional optical disc reproducing apparatus, reproduction control management is executed in accordance with the operation pattern as shown in Fig. 11A, and thus the normal reproduction is performed by treating the copy disc as a legal disc. do. In other words, in the conventional optical disc reproducing apparatus, almost no illegal copy disc can be identified and excluded.

As described above, the conventional copy control management system detects an illegal copy disk by combining digital CCI data and watermark CCI data. However, as an example, if all digital data of the original disc is copied bit by bit before the decoding step such as encryption decryption, the copied digital data can hardly be identified as being illegal copying.

Therefore, if all digital data is copied once from the original disc produced by press, then one generation of copy discs can be infinitely created, and the same generation of illegal copy discs can be copied many times without limitation. As a result, the AV digital content data may be copied, and in the future, a large amount of illegal digital copy discs may be produced and distributed to the market with high quality or higher quality without degrading the quality. This is of concern to the content providers who produce and supply movie titles and music titles.

On the other hand, in the conventional structure disclosed in the second document, a dedicated device is required in order to add a pit of a predetermined pattern to the main data so that it can be recorded on the original disk, and accordingly, the total manufacturing cost increases, which is a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an optical disc reproducing apparatus and an optical disc reproducing control method which prevents reproduction of an illegal copy disc by detecting a wobble pattern on a disc other than a combination of digital CCI and watermark CCI. It is intended to be.

1 is a block diagram of an optical disk reproducing apparatus according to an embodiment of the present invention.

2 is an explanatory diagram showing a reproduction control for copying of the entire data of the optical disc according to the embodiment of the present invention;

3 is a diagram showing a pattern of the reproduction control according to the embodiment of the present invention;

Fig. 4A is a schematic diagram illustrating the physical format of a press-made disc.

Fig. 4B is a schematic diagram illustrating the physical format of a recordable disc.

5 is a circuit diagram of a wobble detection device used in an embodiment of the present invention.

FIG. 6 is a schematic diagram of a wobble detection waveform of the wobble detection device shown in FIG. 5. FIG.

7 (a), 7 (b), 7 (c) and 7 (d) are schematic diagrams showing an example of a physical format of an optical disk used in the embodiment of the present invention.

8 is a flowchart of an optical disc reproduction control according to the embodiment of the present invention.

Fig. 9 is a diagram showing a position of a data structure and copy control management information.

10 (a) and 10 (b) are explanatory diagrams of a conventional optical disc reproduction control in the case of digital copy and analog copy, respectively.

11 is a diagram showing a pattern of a conventional playback control.

12 is an explanatory diagram showing a disadvantage of the conventional playback control.

* Explanation of symbols for main parts of the drawings

1: commercially available press disc 2: spindle motor

3: optical pickup 4: instrument control unit

5: signal processor 6: encryption decoder

7: Digital CCI decoding device 8: AV decoding device

9: watermark CCI decoder

10: digital output interface 11: D / A converter

12: system control unit 13: wobble detection device

In order to achieve the above object, according to one aspect of the present invention, an optical disc reproducing apparatus for reproducing digital audio data including at least one of digital watermark copy control management information and digital copy control management information recorded on an optical disc. To provide. The optical disc reproducing apparatus includes a cipher detection unit for detecting a code in units of digital audio contents of digital audio data being reproduced, a wobble detector for detecting a wobble pattern formed on the optical disc, a detection result of the encryption detector and a detection of the wobble detector It includes a control unit that controls playback based on the result. If the content is encrypted, the control section determines whether or not there is a wobble pattern, stops playback if there is a wobble pattern, and controls the playback operation according to the digital copy control management information if there is no wobble pattern.

According to still another aspect of the present invention, there is provided an optical disc reproduction control method for reproducing digital audio data including at least one of digital watermark copy control management information and digital copy control management information recorded on an optical disc. The method comprises the steps of: detecting a cipher at each digital audio content unit of the digital audio data being reproduced; detecting a wobble pattern formed on the optical disc; detecting results of the cipher detection step; And controlling the playback operation by using. In the case where the content data is encrypted, the reproduction control step determines whether or not there is a wobble pattern, stops playback if there is a wobble pattern, and reproduces according to the digital copy control management information if there is no wobble pattern. To control.

In the above aspect, when the content data is not encrypted, the playback operation is controlled in accordance with the digital watermark copy control management information, with or without a wobble pattern.

Prior to the description, it should be noted that in the present embodiment, content data recorded on the disc is limited to audio data, and copyright-protected content data is essentially encrypted and recorded on the disc.

About digital CCI, when digital CCI is not encrypted, it is easy to be modulated. In addition, when performing analog copy, there is no digital CCI. This is because the audio data is a continuation of the real data and does not have a vertical blanking field. Therefore, in audio data, it is difficult to save digital CCI when performing analog copy. On the other hand, in the case of video data, digital CCI is embedded in a field other than a real data field such as a vertical blanking field, so that digital CCI is preserved even after analog copying.

Best Mode for Carrying Out the Invention Embodiments of the present invention will now be described with reference to FIGS. 1 to 8. In the drawings, like elements are denoted by like reference numerals and description thereof will be omitted.

A unique feature of the present invention is that the wobble pattern of a groove formed on a recordable disc is detected without error and the detection of the wobble pattern is used for discrimination of an illegal copy disc. Here, the wobble pattern is formed as a sine wave meandering groove formed on each recordable disc for displaying clock timing and the like, and such wobble pattern does not exist in a commercially available original press-made disc. It should be noted that. The method and means for detecting the wobble pattern will be described later.

1 is a block diagram showing an optical disk reproducing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the optical disk reproducing apparatus includes a spindle motor 2 for rotating the disk 1, an optical pickup 3 for reading data recorded on the disk 1, and a spindle motor 2. And the instrument control unit 4 for driving and controlling the optical pickup 3, data punching and error correction on the output of the optical pickup 3 to extract the digital signal of the system stream, 4) Digital CCI for detecting digital CCI from the system stream decoded by the signal processing unit 5 for applying a control signal to the system, the encryption decoder 6 for decrypting the encryption from the system stream, and the encryption decoder 6; The decoding device 7 and the AV decoding device 8 which extracts and decodes a digital audio signal from the system stream decrypted by the encryption decoding device 6 are provided.

In addition, the optical disc reproducing apparatus includes a D / A converter 11 for converting the digital audio output signal of the AV decoder 8 into an analog audio signal, and converts the digital audio signal into output data of a non-secure format such as IEC60958. To control the respective operations of the digital output interface 10 for performing output control, the watermark CCI decoder 9 for detecting the watermark CCI from the digital audio output signal of the AV decoder 8, and the entire playback apparatus. The system control part 12 is provided.

The optical disc reproducing apparatus also includes a wobble detecting device 13 for detecting a wobble pattern recorded in advance on the disc 1 via the optical pickup 3. The operation of the wobble detection device 13 is controlled by the system control unit 12. In particular, the system control unit 12 includes wobble detection data indicating the presence or absence of a wobble pattern from the wobble detection device 13, digital CCI from the digital CCI decoding device 7, and a watermark CCI decoding device 9. The watermark CCI is received, and the digital output interface 10, the D / A converter 11, and the instrument control unit 4 are controlled in accordance with the received data.

The reproduction control when using the illegal copy disc in the optical disc reproducing apparatus of the present embodiment will be described below with reference to FIGS. 2 and 3. In this case, the original disc is a commercially produced press-made disc, and it is assumed that encrypted content data is recorded together with the digital CCI set to limit copying and the watermark CCI set to copy prohibition.

Fig. 2 shows a case where a large number of illegal copy discs are created by illegally digitally copying all the digital data of a press-produced original disc with an irregular recorder. In this case, since all the digital data copied on each copy disk is the same as the digital data on the original disk, the data illegally copied and recorded on each copy disk is encrypted (with encryption), and the digital CCI is restricted. Copy enabled, watermark CCI is set to copy-protected.

When the illegal copy disc is reproduced by the optical disc reproducing apparatus according to the present embodiment, reproduction control is executed in accordance with the operation pattern as shown in FIG. More specifically, as shown in Fig. 3, the playback state is controlled in accordance with the combination of the presence or absence of the encryption, the state of the digital CCI and the watermark CCI, and the detection result of the presence or absence of the wobble pattern. It is determined whether the type of is a legitimate original disk or an illegal (illegal) disk.

In the case shown in Fig. 2, since all data is illegally copied from the original disk by using a recordable disk and an illegal copy disk is created by a non-standard recorder, the data copied illegally on each copy disk is encrypted (i.e., , Wobble), and the wobble pattern is detected by the wobble detection unit 13 (when a wobble exists). Therefore, the copy disk used in the playback apparatus of this embodiment is determined to be an illegal disk and stops the playback operation in accordance with the operation pattern shown in Fig. 3B.

Compared with the combination of digital CCI and watermark CCI used in the conventional playback apparatus, this embodiment further uses detection of the wobble pattern. For this reason, even in the case of using an indefinite copy disk in which all data has been copied and recorded from the original disk to each of the disks, the indefinite copy disk can be easily discriminated and excluded as reproduction control.

Next, the specific structure and operation | movement of the wobble detection apparatus 13 are demonstrated below with reference to FIGS. 4 (a) and 4 (b) schematically show recording surfaces of commercially produced press-made discs and recordable discs, respectively. As for the difference between the press-formed disc and the recordable disc, the press-made disc shown in Fig. 4 (a) has only a row of pits 20 formed by the press process, but Fig. 4 (b) In the recordable disc shown in Fig. 2, there is a groove portion 22 between the land portions 21 on which the pit 20 is formed. The groove portion 22 has a wobble pattern 23 meandered in a sinusoidal wave shape. The wobble pattern is necessarily formed on a recordable disc, and is used to record address information and generate a clock signal, which are all necessary for recording of content data. However, commercially available press fabricated disks have only pits on the disks as a press process, and thus no wobble pattern exists.

Therefore, it can be judged that the encrypted content data is recorded and that the encrypted content data includes a wobble pattern. If it is determined that the disk is an illegal copy disk, the error message is displayed on the display unit. Then, playback of the disc is controlled to stop, so that even if such a large number of illegal disks are created, the invalid disks become invalid and cannot be used.

FIG. 5 shows a circuit configuration example of the wobble detector 13, and adds and subtracts four divided output signals VINl to VIN4 read by the optical pickup 3 with the adder / subtracter 41. As shown in FIG. The output signal of the adder / subtracter 41 is amplified by the variable amplifier 42 to generate an RFDIF signal. The RFDIF signal is branched to generate a signal CWBLOUT in the capacitor connection, while the RFDIF signal is input to the bandpass filter 44 through the buffer 43, and the bandpass filter 44 receives the required frequency from the RFDIF signal. Extract. The extracted waveform is binarized by the comparator 45 to generate a binary signal WBLO. 6 schematically shows an example of a waveform model of the output signal CWBLOUT and the binarized signal WBLO.

As a wobble detection algorithm, the frequency of the wobble pattern is a frequency unique to each recordable disc medium (e.g., DVD-R / RW or DVD + R / + RW). In addition, the frequency of the binarized signal WBLO output from the comparator 45 is measured, and the value corresponding to the frequency is counted. If this count value exceeds a threshold within a predetermined measurement time, there is a wobble pattern, and it is determined that the disc to be reproduced is a recordable medium.

4 (a) and 4 (b) schematically show recording surface shapes of commercially produced press-made discs and recordable discs, the specific physical formats are shown in FIGS. 7 (a) to 7 (d). Indicated. For example, Fig. 7A shows the physical format of a reproduction only (ROM) DVD. As a recordable disc, for example, Fig. 7 (b) shows the physical format of a DVD-R / RW disc having a wobble groove pattern, and Fig. 7 (c) shows a wobble groove whose wobble is high frequency. The physical format of the DVD + RW disc having a pattern is shown, and FIG. 7 (d) shows the physical format of the DVD-RAM disc having a wobble land groove pattern.

8 is a flowchart showing an optical disc reproduction control operation according to the embodiment of the present invention. A unique feature of the reproduction control method of the present embodiment, which is different from the conventional reproduction control method, is that if the wobble is detected in the encrypted content data of the disc, including the wobble detection step, the reproduction of the disc is stopped.

Referring to the flowchart shown in FIG. 8, the optical disc reproducing method will be described below. In operation step 1, it is determined whether the audio content data being reproduced is encrypted by detecting a cipher in each digital audio data unit. If the content data is encrypted (YES in step 1), the presence or absence of the wobble pattern is determined by wobble detection (step 2).

If the wobble pattern is detected ("YES" in step 2), since the content data encrypted in the press-produced disc should not include the wobble pattern, it is determined that the disc to be reproduced is an illegal copy disc and the playback operation is stopped in step 13. . This reproduction control corresponds to the operation pattern shown in Fig. 3B.

If the wobble pattern is not detected ("NO" in step 2), digital CCI detection is performed in step 3. If there is a digital CCI ("YES" in step 3), it is determined in step 4 whether the digital CCI is set to copy free. In the case of " NO " in step 4, since copyright protection is claimed, it is determined that the disc is a legitimate disc and the normal playback operation is carried out in step 14.

If the digital CCI is set to copy free ("YES" in step 4), there is no possibility of setting the digital CCI to copy free while claiming copyright protection, so mute both the digital output and the analog output in step 5.

This reproduction control corresponds to the operation pattern shown in Fig. 3A. In the absence of digital CCI ("NO" in step 3), the processing sequence enters the same processing procedure as in the case of no encryption, and watermark detection is performed in step 8.

Referring again to Fig. 1, when the content data is not encrypted ("NO" in step 1), the presence or absence of a watermark CCI is determined in step 8, regardless of the presence or absence of the wobble pattern. If a watermark is detected ("YES" in step 8), it is determined in step 9 whether the watermark CCI is set to copy free. If " YES " in step 9 or there is no watermark (" NO " in step 8), the normal playback operation is executed (step 11). If the watermark CCI is not set to copy free (" NO " in step 9), it is determined that the copy disk is an illegal disk and the digital output and analog output are muted (step 10). This reproduction control corresponds to the operation pattern shown in Fig. 3C.

The above operation is executed in each reproduction unit. If the processing operation does not reach the end of the playback unit or the end of the entire playback of the data stream (“NO” in step 6, “NO” in step 7), then muting both the digital output and the analog output Reset to 1. If the processing operation reaches the end of the entire reproduction of the data stream (YES in step 7), the operation ends.

According to the present invention as described above, by configuring the wobble detection device together with the digital CCI and the watermark CCI, illegal copying of all original digital disks can be prevented. More specifically, the conventional optical disc reproducing apparatus cannot discriminate an illegal copy disc produced by digitally copying all contents of the original disc to a recordable disc using a PC or the like.

On the other hand, according to the optical disk reproducing apparatus of the present invention, by additionally providing a wobble detection device, all the illegally copied disks copied on the recordable disc are discriminated to prevent reproduction.

While the invention has been described in conjunction with the preferred embodiments with reference to the accompanying drawings, it should be borne in mind that various changes and modifications can be made by those skilled in the art. Such changes and modifications are to be understood as included within the scope of the invention as defined by the appended claims, unless they depart therefrom.

Claims (4)

An optical disc reproducing apparatus for reproducing digital audio data including at least one of electronic watermark copy control management information and digital copy control management information recorded on an optical disc, the apparatus comprising: A password detecting unit for detecting a password in units of digital audio content of digital audio data being played; A wobble detector configured to detect a wobble pattern formed on the optical disk; A control unit for controlling the reproduction operation by using the detection result of the encryption detector and the detection result of the wobble detector; When the content data is encrypted, the control section determines whether or not there is a wobble pattern, and stops playback if there is the wobble pattern, and if there is no wobble pattern, according to the digital copy control management information. An optical disc reproducing apparatus, which controls a reproducing operation. The method of claim 1, And when the content data is not encrypted, the controller controls the playback operation according to the electronic watermark copy control management information, regardless of the presence or absence of the wobble pattern. An optical disc reproduction control method for reproducing digital audio data including at least one of electronic watermark copy control management information and digital copy control management information recorded on an optical disc, Detecting a password in units of digital audio content of the digital audio data being played; Detecting a wobble pattern formed on the optical disk; Controlling the playback operation using the detection result in the encryption detection step and the detection result in the wobble detection step, When the content data is encrypted, the reproducing operation control step determines whether or not the wobble pattern is present, and stops reproducing when the wobble pattern exists, and controls the digital copy if there is no wobble pattern. An optical disc reproduction control method characterized by controlling a reproduction operation in accordance with management information. The method of claim 3, And if the content data is not encrypted, controlling the reproduction operation according to the electronic watermark copy control management information, regardless of the presence or absence of the wobble pattern.